Core-stripping machine



y 1936- M. c. KLINE 2,047,105

' CORE STRIPPING MACHINE Filed June 29 1935 E INVENTOR. Myra/2 C. Kline.

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A'ITO EY.

Patented July 7, 1936 UNITED STATES PATENT OFFICE 7 Claims.

This invention relates generally to core making machines and it hasparticular relation to core stripping machines.

It has been the practice in stripping cores, es-

; pecially small cores insmall. job lots, to use a hammer for makingimpacts on the core box to free it from the surface of the sand whichforms the core. This results, many times in the edges of the cores beingbroken off requiring time to be taken for patching the broken surfaces,and also the size and generalcontourof the core is variated by thisimpact. The core making machines now in use require a new set up forevery job and they have therefore been found impracticable on small Joblots.

It is, accordingly, an object of my invention to provide a core stripperwhich is universal in character and which will remove the core box fromthe core with the maximumof efiiciency.

Another object of my. invention is to provide a core stripper especiallyadapted for smallcores which will remove the core box fromthe corewithout knocking 01f portions of the surface of the core. Another objectof my invention is to provide a core stripper which willrbe adapted formany different sizes and shapes of. core boxes without change of set-upof the machine.

Another object of my invention is to provide a core stripper which willbe easy to manufacture,

economical in cost, eflicient in use and easy to maintain. Anotherobject of my invention is to provide a core stripper which is portableand which may be set up in any part of the shop. 1 I Another object ofmy invention is to provide a core stripper which will delay theseparation of the core box from the core long enough after the vibratorcommences operating to provide a complete separation of the core fromthe core box.

Another object of my invention is to provide a core stripper formiscellaneous small 'job lots which do not warrant a set-up on thestandard core making machines now in user; j

Other objects of my invention will'become apparent from the followingdetailed description taken in conjunction with the accompanying drawingin which Fig. 1 is a plan view of my novel core stripper. Fig. 2 is aview in side elevation of my novel core stripper. I

Fig. 3 is a side elevational view showing the angular frame of the corestripper in a lifted position.

Fig. 4 is an enlarged view in side elevation showing the cylinder partlyin section.

Referring to the drawing, apparatus showing my preferred construction inFigs. land 2 comprises a base I and a post or plunger 2 mounted in 5 onecorner thereof. An open ended cylinder 3 is invertedly mounted over theplunger 2 and reciprocates relative to the plunger 2. A flanged washer lsecured by a screw 5 is mounted on the upper end of the plunger 2 andits periphery con- 10 tactsthe inner Walls of the cylinder 3.

An .angle frame 6, preferably set at an angle of ninety degrees, issecured to the moving cylinder 3 by suitable clamps I, and movestherewith upon the upward movement of the cylinder 3. A I guide post 8is also mounted on the base I and jaws 9 integral with the angle frame 6engage the post 8 to guide the angle frame 6 in a straight upward path.A vibrator II] is secured. to the frame 6 and moves therewith in ordertovibrate the frame 6 upon air being admitted to the vibrator I E]. Itwill be apparent that the base I will be indirectly vibrated through,the plunger 2 although to a much lesser degree than the frame 6. p Avalve I I having a handle l2,;fo,r adjusting the size of the aperture inthe valve I I is disposed in the supply line I3 immediately adjacent arestricted aperture M in the plug I5 which is disposed in the upperportion of the cylinder 3. The restricted aperture I4 normally delaysthe upward movement of the cylinder 3 on the plunger 2 and causes thecylinder to rise slowly. The handle l2 adjusts the size of the aperturein the valve II to regulate the length of delay and the rate ofrise ofthe cylinder 3, on the plunger 2. The air supply line l3 supplies air tothe vibrator II] a well as to the cylinder 3 to raise the cylinder 3 onthe plunger 2. A tension spring I 6 secured at its lower end to a lugI'I on'thebase I and at .40 its upper end to a lug l8 on the top of thecyl-. inder 3; is provided to return the cylinder 3 to its normalpositionafter the completion of the core Stripping operation. 7Anysuitable' means (not shown) -may beprovided to control the air supplyline I3, toprovideair for theyibrator I0 and the cylinder 3. An apertureIQ of larger diameter than the restricted aperture I4 in the plug I5 isdisposed in the side wall of the cylinder 3 to limit the upward movementof the cylinder 3 on the plunger 2.

The faces 20 of the frame 6 may be roughened by any suitable means or aroughened paper 2I such as sand paper or other suitable material may bedisposed on the face 20 of the frame 6 to provide a gripping surface forthe core box 22 when it is held thereagainst. The frame 6 moves relativeto the base l .and it normally seats thereon.

In operation, the core box 22 is filled with sand, struck off, andplaced in an inverted position on the core plate 23 in the usual manner.The core plate 23 is disposed on the base I and the core box 22 ismanually forced into the apex of the angle frame 6. Although clampingmeans could be provided for the core box 22, it has been found that theplacing of the core box 22 against the roughened face 20 of the frame 6provides a much simpler and quicker method of stripping cores and it isuniversal in character and the work is entirely satisfactory. Controlmeans for the air supply line (not shown) usually a foot lever, is thenoperated to supply air to the vibrator IE] and to the cylinder 3. Thevibrator l0 cornmences to operate immediately to vibrate the frame 6directly and the base I indirectly to a lesser extent than the frame 6before there is any upward movement of the frame 6 due to the raising ofthe cylinder 3. The air passing through the restricted aperture I4 andthe aperture in the valve II, which causes an initial delay in themovement of the cylinder 3 on the plunger 2, slowly raises the cylinder3 and the frame 6 attached thereto on the plunger -2 to a position asshown in Fig. 3. The core box 22 being held against the face 20 of theframe 6 is raised with the frame 6 and is separated from the core 24which remains on the core plate 23'. The upward movement of the frame 6is limited by the aperture 19 in the side wall of the cylinder 3 forwhen the aperture l9 reaches the upper portion of the flanged washer 4,the air passes out through this aperture l9 which is larger than therestricted aperture l4 preventing further upward movement. The core box22 is then removed, the air pressure released, and the spring l6 returnsthe cylinder 3 and the frame 6 attached thereto to its originalposition. 7

Although I have shown an angle frame which moves away from the base, theidea disclosed in my invention could be built in a machine having a basewhich moves away from a stationary frame.

It will be apparent that I have provided a novel core stripper which maybe used on many different sizes and shapes of cores, which is especiallyadaptable for small job lots not warranting a set-up on a conventionalcore making machine, which requires no preliminary set-up, and whichproduces a perfect core.

Various changes may be made in the'specific embodiment of the presentinvention without diverting from the spirit thereof, or within the scopeof the appended claims.

What I claim is: r a

1. A core stripping machine comprising a base, an inverted plungermounted on said base, an open ended cylinder mounted on said plunger andmovable thereon relative to said base, an angular frame carried by saidcylinder and movable therewith to position and raise various sizes andshapes of independently constructed core boxes away from their cores,means for moving said cylinder on said plunger away from said base, andmeans for automatically delaying the movement of said cylinder with itsattached frame on said plunger after said moving means has been placedin an operative position, and means for vibrating said frame directlyduring and after and said base indirectly during said delay period.

2. Apparatus as in claim 1 wherein means are provided for limiting themovement of said cylinder on said plunger.

3. A core stripping machine comprising a base, an angular open-sidedframe movable relative to said base having a roughened face surface forpositioning and separating various sizes and shapes of core boxes fromtheir respective cores, said core boxes being held against the face ofsaid frame, means for separating said base and said frame, a vibratorfor vibrating said base and said frame, and means for automaticallydelaying the separation of said base and said frame after saidseparating means has been placed in a position for operation and whilesaid vibrating means is in operation, said delaying means alsopermitting the separation to take place very slowly.

4. A core-stripping machine comprising a base, an open angular framedisposed on said base having faces disposed at substantially degreesfrom each other for positioning and raising various sizes and shapes ofcore boxes away from their cores, means for separating said base andsaid frame a predetermined amount, means for delaying the movement ofsaid frame away from said base after said separating means are placed inan operative position, and vibrating means disposed on said frame forvibrating said frame directly and for vibrating said base indirectlyduring said delay period, the vibration of said base being practicallynegligible after the separation of said base and said frame.

5, Claim the same as in claim 4 wherein said vibrator, and saidseparating means all function automatically upon operation of a singleair valve.

6. A core-stripping machine comprising a base, an upright plunger rodmounted on said base, an open-ended cylinder mounted on said rod anddisposed to move thereon, an open angular frame carried by said cylinderand movable therewith relative to said base to position and separatevarious sizes and shapes of core-boxes from their respective cores, avibrator for vibrating said frame and for vibrating said base to alesser degree than the frame, means for supplying air to said vibratorand said cylinder, said air causing said cylinder to move on saidplunger away from said base, and controlled delay means which operateupon the. opening of said air supply means to automatically delay themovement of said cylinder with its attached frame away from the basewhile said vibrator is in operation. I

7. Apparatus as in claim 6 wherein means are provided for returning thecylinder to its normal position when the air supply is cut off.

. MYRON C. KLINE.

